| 摘要 |
PURPOSE:To reduce power consumption of the titled device by a method wherein a plurality of ferromagnetic materials are adhered on the same radius of a moving coil member, thereby enabling to unnecessitate the usage of a spring to maintain the initial position and the like. CONSTITUTION:When a release button is pressed, a current is applied to a fixed electromagnet 8 immediately before a current is applied to the coil 6a of a moving coil member 6. One of a plurality of ferromagnetic materials 7 fixed on the member 6 is attracted to the electromagnet 8 by the function of a permanent magnet 8a when it is in a non-conductive state, but the attracting force of the magnet 8a is erased by the above-mentioned application of current, thereby enabling the member 6 to rotate. Immediately after the performance of the above procedure, the member 6 begins to rotate due to application of a current on the coil 6a, and a throttling shutter vane 9 which is interlocked with the above begins to open. When a suitable exposure is obtained at the opened aperture obtained by the vane 9, the current application to the member 6 is shut out at that moment, one of the ferromagnetic materials 7 is attracted by the function of the magnet 8, and the member 6 is fixed at that moment. |
